[PATCH v3 04/15] KVM: arm64: Don't pass kvm_pgtable through kvm_pgtable_walk_data

Oliver Upton
2022-10-27T22:19:01Z

In order to tear down page tables from outside the context of
kvm_pgtable (such as an RCU callback), stop passing a pointer through
kvm_pgtable_walk_data.

No functional change intended.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/hyp/pgtable.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index db25e81a9890..93989b750a26 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -50,7 +50,6 @@
#define KVM_MAX_OWNER_ID 1

struct kvm_pgtable_walk_data {
- struct kvm_pgtable *pgt;
struct kvm_pgtable_walker *walker;

u64 addr;
@@ -88,7 +87,7 @@ static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level)
return (data->addr >> shift) & mask;
}

-static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
+static u32 kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
{
u64 shift = kvm_granule_shift(pgt->start_level - 1); /* May underflow */
u64 mask = BIT(pgt->ia_bits) - 1;
@@ -96,11 +95,6 @@ static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
return (addr & mask) >> shift;
}

-static u32 kvm_pgd_page_idx(struct kvm_pgtable_walk_data *data)
-{
- return __kvm_pgd_page_idx(data->pgt, data->addr);
-}
-
static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
{
struct kvm_pgtable pgt = {
@@ -108,7 +102,7 @@ static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
.start_level = start_level,
};

- return __kvm_pgd_page_idx(&pgt, -1ULL) + 1;
+ return kvm_pgd_page_idx(&pgt, -1ULL) + 1;
}

static bool kvm_pte_table(kvm_pte_t pte, u32 level)
@@ -255,11 +249,10 @@ static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
return ret;
}

-static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data)
+static int _kvm_pgtable_walk(struct kvm_pgtable *pgt, struct kvm_pgtable_walk_data *data)
{
u32 idx;
int ret = 0;
- struct kvm_pgtable *pgt = data->pgt;
u64 limit = BIT(pgt->ia_bits);

if (data->addr > limit || data->end > limit)
@@ -268,7 +261,7 @@ static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data)
if (!pgt->pgd)
return -EINVAL;

- for (idx = kvm_pgd_page_idx(data); data->addr < data->end; ++idx) {
+ for (idx = kvm_pgd_page_idx(pgt, data->addr); data->addr < data->end; ++idx) {
kvm_pte_t *ptep = &pgt->pgd[idx * PTRS_PER_PTE];

ret = __kvm_pgtable_walk(data, pgt->mm_ops, ptep, pgt->start_level);
@@ -283,13 +276,12 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
struct kvm_pgtable_walker *walker)
{
struct kvm_pgtable_walk_data walk_data = {
- .pgt = pgt,
.addr = ALIGN_DOWN(addr, PAGE_SIZE),
.end = PAGE_ALIGN(walk_data.addr + size),
.walker = walker,
};

- return _kvm_pgtable_walk(&walk_data);
+ return _kvm_pgtable_walk(pgt, &walk_data);
}

struct leaf_walk_data {
--
2.38.1.273.g43a17bfeac-goog